Malicious PDF — malware analysis report

Static analysis result for SHA-256 912cfb921c225814…

MALICIOUS

PDF

109.4 KB Created: 2021-06-25 12:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29b210d8527662ce777c23c86dfe9013 SHA-1: bdbc4b2bae98e7f4aa6ecefe99d197186fd4d0fa SHA-256: 912cfb921c225814216aae33f8d60e55a15e9db7a3fc68b898fbce2416cfbd67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. These links likely serve as lures to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=nested+for+loop+terraform
    • https://foundryindia.org/userfiles/file/21715977252.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070372977195---supabomediwodo.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dd65f2d56---pinabumipuvudibogolaru.pdf
    • http://drkoopman.nl/cmsimages/file/tosofibarojosod.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097b32937a1e---45481923260.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/taibnp2eh1cn2al5gjtgaujao3/2320267792.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/rutineduwewuduwoxupagolij.pdf
    • http://sosnovgeo.ru/userfiles/file/48510681841.pdf
    • http://maility.pl_adresuserfiles/file/75247039493.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905962ea240---23583235302.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/fca9a3034b5930d8c23c938a8301f96e/daxabuki.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/961vin4os6ogv3gffru08dk5ms/zawamozagezabowutuzaxo.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/25412528fce2699f652c2fa990975081/pezejelujidemike.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014969.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14969 16792 bytes
font_01_sfnt_off0001617b.bin
ed01e2f1f08ee05551e17f31b724e6c98198bac8f1073508daa20856f065259a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1617B 18112 bytes
font_02_sfnt_off00019172.bin
6a8ca2110223cc62a77ba6e9056f3430bb1ce384ed58f44e5fb468c8d9e2124e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19172 10440 bytes

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